From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wei Liu <wei.liu2@citrix.com>
Subject: Re: [PATCH] libxl: Be more careful with error handling
 in libxl__dm_runas_helper()
Date: Thu, 26 Nov 2015 10:26:29 +0000
Message-ID: <20151126102629.GI15747@citrix.com>
References: <1448488569-3003-1-git-send-email-boris.ostrovsky@oracle.com>
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To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: wei.liu2@citrix.com, xen-devel@lists.xen.org, ian.jackson@eu.citrix.com, ian.campbell@citrix.com, stefano.stabellini@eu.citrix.com
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On Wed, Nov 25, 2015 at 04:56:09PM -0500, Boris Ostrovsky wrote:
> getpwnam_r() has fairly complicated return rules. From man pages:
> 
>   RETURN VALUE
>       ...
>       On success, getpwnam_r() and getpwuid_r() return zero, and set
>       *result to pwd.  If no matching  password record was found, these
>       functions return 0 and store NULL in *result. In case of error,
>       an error number is returned, and NULL is stored in *result.
>   ERRORS
>       0 or ENOENT or ESRCH or EBADF or EPERM or ...
>             The given name or uid was not found.
> 

This is Linux manpage.

Actually http://pubs.opengroup.org/onlinepubs/9699919799/functions/getpwnam.html
doesn't specify such behaviour.  And FreeBSD doesn't share Linux's view either.

Wei.